Flat-face epoxy-bonded concrete joints loaded in torsion: Physical modelling

Leon Chernin (Lead / Corresponding author), Moray Newlands, Noushin Khosravi

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Abstract

Joints in concrete structures must perform under various complex loads including torsion. This paper reports the results of an experimental programme investigating the static torsional performance of epoxy-bonded concrete joints. Torsion tests were performed using a custom experimental setup able to apply torque on a hollow concrete prism with an epoxy joint in the middle. The tested specimens failed in both cohesive and mixed modes. The cohesive failure mode was characterised by cracking in the body of concrete, while the mixed mode also included partial debonding of the joint. The cohesive mode was dominant, more ductile and exhibited higher torsional strength. The cracking behaviour of the jointed specimens was typical of concrete prisms under torsion except that in the mixed mode a crack developed along the joint on two or three specimen sides. Digital Image Correlation, applied for monitoring surface strain, showed that inclined bands of high shear strain passed across the joint during the tests. The mechanism of concrete-epoxy debonding was investigated using two standard testing methods. The low shear strength of concrete near the epoxy joint was identified as the source for the weaker, stiffer and more brittle response of the mixed failure mode in the torsion tests.
Original languageEnglish
Article number134558
Number of pages136
JournalConstruction and Building Materials
Volume411
Early online date17 Dec 2023
DOIs
Publication statusPublished - 12 Jan 2024

Keywords

  • Epoxy
  • Concrete joint
  • Torsion
  • Shear
  • Experimental study
  • Digital Image Correlation

ASJC Scopus subject areas

  • General Materials Science
  • Building and Construction
  • Civil and Structural Engineering

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